Electric field heavy metal leaching device and method

A heavy metal, electric field technology, applied in chemical instruments and methods, biological sludge treatment, water pollutants, etc., can solve the problems of slow restoration, long plant growth cycle, etc., to achieve voltage, wide application, leaching and dehydration uniform effect

Active Publication Date: 2015-12-02
TIANJIN UNIV
View PDF3 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Phytoremediation uses the absorption, volatilization, root filtration, degradation, and stabilization of plants to purify and transfer heavy metals. It has the advantages of being green and environmentally friendly, and has become a research hotspot in recent years. However, the plant growth cycle is long and the restoration is slow. Usually a plant Can only absorb one or two heavy metals, and plants have certain requirements on the soil

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Electric field heavy metal leaching device and method
  • Electric field heavy metal leaching device and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The power supply method adopts continuous DC power supply, and the eluent is citric acid.

[0026] The anode plate 1 and the cathode plate 2 are connected to the positive pole and the negative pole of the DC power supply 3, the distance between the pole plates is 5mm, and the power supply voltage is 20V. Squeeze and inject the sludge 6 from the mud inlet 4, and at the same time release the eluent 7 to start rinsing. The concentration of citric acid is 0.6mol / L, and the flow rate is 0.1L / min. When the sludge 6 passes through the leaching dehydration electric field cavity, the heavy metals in it are fully dissolved under the action of acid production at the anode, strong oxidation, and acidification of the eluent, and are dehydrated with the water in the sludge 6 under the action of the electric field Liquid 9 flows out from the mesh cathode plate. The treated sludge 6 is discharged from the sludge outlet 8, and is collected uniformly for subsequent disposal. After tre...

Embodiment 2

[0030] The power supply mode is intermittent DC power supply, and the eluent is nitric acid.

[0031]The anode plate 1 and the cathode plate 2 are connected to the positive pole and the negative pole of the DC power supply 3, the distance between the pole plates is 20mm, and the power supply voltage is 80V. The specific operation of DC power supply intermittent power supply is: power supply for 1min, intermittent 20s, and so on cycle. Squeeze and inject the sludge 6 from the mud inlet 4, and at the same time release the eluent 7 to start rinsing. The concentration and flow rate of nitric acid are selected according to the demand, and the pH value of the sludge 6 is kept at about 2. When the sludge 6 passes through the leaching dehydration electric field cavity, the heavy metals in it are fully dissolved under the action of acid production at the anode, strong oxidation, and acidification of the eluent, and are released with the water in the sludge under the action of the elec...

Embodiment 3

[0035] The power supply mode is pulse power supply, and the eluent is hydrochloric acid + hydrogen peroxide.

[0036] The anode plate 1 and the cathode plate 2 are connected to the positive pole and the negative pole of the pulse power supply 3, the distance between the pole plates is 50mm, and the power supply voltage is 100V. Pulse power supply is automatically controlled, and the power supply time of each cycle accounts for 80%. Squeeze and inject the sludge 6 from the mud inlet 4, and at the same time release the eluent 7 to start rinsing. The eluent is a mixture of hydrochloric acid and hydrogen peroxide, and the oxidation of hydrogen peroxide can improve the effect of acid leaching. Hydrochloric acid and hydrogen peroxide are mixed and injected, the concentration of hydrogen peroxide is about 2%, and the pH value of sludge 6 is controlled at about 2 during operation. When the sludge 6 passes through the leaching dehydration electric field cavity, the heavy metals in it...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to an electric field heavy metal leaching device and method. The electric field heavy metal leaching device comprises an upper electrode and a lower electrode which are respectively used as an anode plate and a cathode plate of the leaching electric field, wherein the two plates constitute an electric field cavity for dehydration; and the anode is a hollow plate electrode, the cathode is a metal mesh electrode, and the anode and cathode are arranged in an insulated mode and respectively connected with a positive pole and a negative pole of a direct current power supply. The method comprises the following steps: sludge with the water content of 40% or above is pressurized and injected into the electric field cavity for elution and dehydration, and moves from the inlet to the outlet in the electric field at uniform speed; meanwhile, the electric field power supply is turned on, and an acid solution is pressurized and injected via a liquid injection hole of the anode, so that harmful substances of heavy metals in the sludge are eluted under the acid production and oxidizing actions of the electric field and the combined actions of the injected acid solution; and thus, insoluble heavy metals are sufficiently dissolved in the solution and separated out along with the dehydration solution from the cathode side under the action of the electric field, and the purified sludge is discharged via the outlet. The device and method implement simultaneous actions of elution and dehydration on heavy metals. The device and method can simultaneously remove multiple heavy metals, and have wide applicability.

Description

technical field [0001] The invention belongs to a sludge acid leaching and heavy metal separation device, in particular to an electric field leaching device and method. Background technique [0002] Sludge is a by-product of sewage treatment plants. Municipal sludge is rich in nutrients such as nitrogen, phosphorus, and organic matter. More and more attention has been paid to the land use of sludge. However, heavy metals are one of the main reasons for limiting its subsequent use. Heavy metals in sludge mainly include Pb, Cd, Hg, Cr, Ni, Cu, Zn, As, etc., which have the characteristics of concealment, long-term, irreversible, etc., and are easy to be enriched through the food chain. Plants and animals cause great harm. [0003] At present, the treatment methods of heavy metals are mainly divided into two categories: stabilization and removal. Stabilization technology is to reduce the activity and availability of heavy metals by changing the existing forms of heavy metals. ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/02C02F101/20C02F101/22
Inventor 马德刚钱婧婧
Owner TIANJIN UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap